When scientists talk about the cryosphere, they mean the places on Earth where water is in its solid form, frozen into ice or snow. Read more ...

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Megadunes are slightly rounded at their crests and are so subtle that a person on the ground cannot see the pattern. In this aerial photograph, the megadune area looks like light and dark stripes in the snow.
Image Credit: Courtesy Ted Scambos and Rob Bauer, NSIDC
Megadunes Web site